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* Added a primop unsafeDiscardOutputDependency needed by Disnix to 

pass derivation paths to a builder without actually building them.
This commit is contained in:
Eelco Dolstra 2009-10-21 15:05:30 +00:00
parent 6f7d7bc1de
commit 437077c39d
1 changed files with 34 additions and 3 deletions
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37
src/libexpr/primops.cc
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@ -435,10 +435,18 @@ static Expr prim_derivationStrict(EvalState & state, const ATermVector & args)
drv.inputDrvs[*j] = singleton<StringSet>("out");
}
}
debug(format("derivation uses `%1%'") % path);
/* See prim_unsafeDiscardOutputDependency. */
bool useDrvAsSrc = false;
if (path.at(0) == '~') {
path = string(path, 1);
useDrvAsSrc = true;
}
assert(isStorePath(path));
if (isDerivation(path))
debug(format("derivation uses `%1%'") % path);
if (!useDrvAsSrc && isDerivation(path))
drv.inputDrvs[path] = singleton<StringSet>("out");
else
drv.inputSrcs.insert(path);
@ -1027,6 +1035,28 @@ static Expr prim_unsafeDiscardStringContext(EvalState & state, const ATermVector
}
/* Sometimes we want to pass a derivation path (i.e. pkg.drvPath) to a
builder without causing the derivation to be built (for instance,
in the derivation that builds NARs in nix-push, when doing
source-only deployment). This primop marks the string context so
that builtins.derivation adds the path to drv.inputSrcs rather than
drv.inputDrvs. */
static Expr prim_unsafeDiscardOutputDependency(EvalState & state, const ATermVector & args)
{
PathSet context;
string s = coerceToString(state, args[0], context);
PathSet context2;
foreach (PathSet::iterator, i, context) {
Path p = *i;
if (p.at(0) == '=') p = "~" + string(p, 1);
context2.insert(p);
}
return makeStr(s, context2);
}
/* Expression serialization/deserialization */
@ -1156,6 +1186,7 @@ void EvalState::addPrimOps()
addPrimOp("__substring", 3, prim_substring);
addPrimOp("__stringLength", 1, prim_stringLength);
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);
// Versions
addPrimOp("__parseDrvName", 1, prim_parseDrvName);